FILE- In this Aug. 30, 2012, file photo, a tour group walks through the campus of Harvard University in Cambridge, Mass. A report released Tuesday, Jan. 26, 2016, shows a drop in college endowment growth during the school year ending June 30, 2015, after two years of strong gains. Harvard University stayed atop the list, followed by Yale University and the University of Texas system. At nearly 300 colleges in the study, endowments shrank last year. (AP Photo/Elise Amendola, File) ORG XMIT: BX301(Photo: Elise Amendola, AP)

An Arizona man who was arrested Friday faces federal charges for threatening to bomb Harvard University and shoot students at the school's 2017 Black Commencement ceremony to "end their pro-black agenda."

Zuckerman allegedly commented, using slurs and threats, on a Harvard University Instagram post in early May 2017.

"If the blacks only ceremony happens, then I encourage violence and death at it. I’m thinking two automatics with extendo clips. Just so no (N-word) gets away,” Zuckerman wrote, according to the statement.

Social media threat: '#bombharvard'

Zuckerman allegedly commented on another Harvard Instagram post, saying: “#bombharvard and end their pro-black agenda." He allegedly used the phrase "#bombharvard" on other users' posts approximately 11 times in four minutes, according to the statement.

Harvard graduate students held the first-ever Black Commencement ceremony on May 23, 2017. The gathering united black students across the university to celebrate their achievements and recognize challenges they faced. The event, now in its second year, is open to anyone at the university and honors students who "identify with the African diaspora," according to a notice on Harvard's website.

A post shared by Jason Frazer (@jasonfrazertv) on May 23, 2017 at 3:20pm PDT

The event took place two days before the University's 366th Commencement for all graduating students.

Many colleges — including Arizona State University, one of the nation's largest universities by enrollment — hold smaller commencement ceremonies for subgroups separate from the main commencement ceremony.

ASU has several "special interest convocations," including the American Indian, Asian/Asian Pacific American, Black and African, Hispanic, International Student, and Rainbow (recognizing Lesbian, Gay, Bisexual, Transgender, Queer and Questioning and their Allies) convocations, meant for groups to celebrate students' graduation in smaller settings.

#BlackAtHarvard: A celebration

Harvard students posted on social media, celebrating the event. "Minutes away from Harvard's first-ever black graduation!" wrote one Twitter user, using the hashtag #BlackAtHarvard, in a post showing students seated under a canopy of green trees wearing black and crimson gowns.